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any number of

any number of idiom

Many; also, no particular amount of. The meaning here depends on the context. I can give you any number of reasons for John's absence means I can offer many reasons. Any number of subscribers might stay home means that an unknown number will not attend.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.